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UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert

Status: upstream: reported C repro on 2025/01/01 11:36
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+029d1989099aa5ae3e89@syzkaller.appspotmail.com
First crash: 139d, last: 8d15h
Cause bisection: introduced by (bisect log) :
commit 46522a75a47ed8db6da54f37c4dcf934e12fe540
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Mon Nov 25 05:21:27 2024 +0000

  bcachefs: Bad btree roots are now autofix

Crash: UBSAN: shift-out-of-bounds in __btree_node_pinned (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert 0 (1) 2025/01/01 11:36
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/01/11 12:22 17m retest repro linux-next error
2025/01/11 12:22 33m retest repro linux-next error

Sample crash report:
  node offset 0/16 bset u64s 0: incorrect max key U64_MAX:18374686479671623680:50331647, btree topology error: 
bcachefs (loop0): flagging btree xattrs lost data
bcachefs (loop0): running explicit recovery pass check_backpointers_to_extents (16), currently at recovery_pass_empty (0)
bcachefs (loop0): running explicit recovery pass scan_for_btree_nodes (1), currently at recovery_pass_empty (0)
bcachefs (loop0): error reading btree root btree=xattrs level=0: btree_node_read_error, fixing
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/btree_cache.c:218:18
shift exponent 251 is too large for 64-bit type 'unsigned long long'
CPU: 0 UID: 0 PID: 5830 Comm: syz-executor323 Not tainted 6.15.0-rc1-syzkaller-00246-g900241a5cc15 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:492
 __btree_node_pinned fs/bcachefs/btree_cache.c:218 [inline]
 __bch2_btree_node_hash_insert+0x1b32/0x1ba0 fs/bcachefs/btree_cache.c:294
 bch2_btree_node_hash_insert+0x7e/0xc0 fs/bcachefs/btree_cache.c:309
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1791 [inline]
 bch2_btree_root_read+0x605/0x7e0 fs/bcachefs/btree_io.c:1819
 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581
 bch2_fs_recovery+0x28e4/0x3e20 fs/bcachefs/recovery.c:928
 bch2_fs_start+0x310/0x620 fs/bcachefs/super.c:1059
 bch2_fs_get_tree+0x113e/0x18f0 fs/bcachefs/fs.c:2253
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3879
 do_mount fs/namespace.c:4219 [inline]
 __do_sys_mount fs/namespace.c:4430 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4407
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3aa1b3afaa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe042c3768 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe042c3780 RCX: 00007f3aa1b3afaa
RDX: 0000200000000180 RSI: 0000200000000540 RDI: 00007ffe042c3780
RBP: 0000200000000540 R08: 00007ffe042c37c0 R09: 0000000000005964
R10: 0000000000800000 R11: 0000000000000282 R12: 0000200000000180
R13: 00007ffe042c37c0 R14: 0000000000000003 R15: 0000000000800000
 </TASK>
---[ end trace ]---

Crashes (100):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/11 16:07 upstream 900241a5cc15 94486846 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/11 02:59 upstream 0c7cae12f67c 94486846 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2024/12/28 12:01 linux-next 8155b4ef3466 d3ccff63 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2024/12/28 11:42 linux-next 8155b4ef3466 d3ccff63 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/05/08 16:45 upstream d76bb1ebb558 dbf35fa1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/05/05 08:13 upstream 92a09c47464d b0714e37 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/05/02 14:34 upstream ebd297a2affa d7f099d1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/30 15:47 upstream b6ea1680d0ac 937aafd7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/30 07:00 upstream 8bac8898fe39 85a5a23f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/27 20:21 upstream 5bc1018675ec c6b4fb39 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/27 11:34 upstream 5bc1018675ec c6b4fb39 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/26 18:26 upstream f1a3944c860b c6b4fb39 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/25 11:15 upstream 02ddfb981de8 dea5c7e4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/25 01:21 upstream e72e9e693307 e3715315 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/23 03:39 upstream bc3372351d0c 53a8b9bd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/21 21:47 upstream 9d7a0577c9db 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/17 13:53 upstream cfb2e2c57aef 552876f8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/17 11:12 upstream cfb2e2c57aef 552876f8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/17 02:06 upstream c62f4b82d571 a95239b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/16 20:47 upstream c62f4b82d571 a95239b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/16 07:44 upstream 1a1d569a75f3 a95239b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/15 19:06 upstream 1a1d569a75f3 85125322 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/15 16:27 upstream 834a4a689699 85125322 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/14 17:27 upstream 8ffd015db85f 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/14 10:18 upstream 8ffd015db85f 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/12 02:36 upstream e618ee89561b 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/11 04:57 upstream 0c7cae12f67c 94486846 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/11 02:39 upstream 0c7cae12f67c 94486846 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/06 06:40 upstream 56f944529ec2 1c65791e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/05 00:32 upstream e48e99b6edf4 c53ea9c9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/03 08:03 upstream a1b5bd45d4ee 996a9618 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/04/02 06:32 upstream 91e5bfe317d8 c799dfdd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/31 08:27 upstream 4e82c87058f4 d3999433 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/31 03:17 upstream 7f2ff7b62617 d3999433 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/30 22:55 upstream 7f2ff7b62617 d3999433 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/30 12:59 upstream 93d52288679e d3999433 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/28 23:46 upstream acb4f33713b9 9a1a9e31 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/28 16:34 upstream acb4f33713b9 9a1a9e31 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/28 10:17 upstream 4fa118e5b79f 6c09fb82 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/26 18:01 upstream 1e26c5e28ca5 19e40f48 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/24 11:48 upstream 586de92313fc 875573af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/21 03:47 upstream 5fc319360819 62330552 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/20 20:21 upstream 5fc319360819 62330552 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/20 11:49 upstream a7f2e10ecd8f 62330552 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/18 06:53 upstream fc444ada1310 ce3352cd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/17 21:01 upstream 4701f33a1070 489e2dc8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/17 10:29 upstream 4701f33a1070 948c34e4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/17 02:19 upstream cb82ca153949 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/16 05:45 upstream eb88e6bfbc0a e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/15 03:55 upstream 83158b21ae9a e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/13 03:30 upstream 0fed89a961ea 1a5d9317 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/10 21:18 upstream 80e54e84911a 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/09 08:26 upstream b7c90e3e717a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/03/08 13:35 upstream 21e4543a2e2f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2025/01/21 03:19 upstream 3d3a9c8b89d4 6e87cfa2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2024/12/28 11:29 linux-next 8155b4ef3466 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
2024/12/28 11:29 linux-next 8155b4ef3466 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in __bch2_btree_node_hash_insert
* Struck through repros no longer work on HEAD.